zograscope

thumb|upright|Large table-top viewer for vue d'optique prints. Late 18th century thumb|right|An example of a picture designed for viewing under a zograscope equipped with a mirror, its text mirror writing|written right-to-left.

A zograscope is an optical device for magnifying flat pictures that also enhances the sense of the depth shown in the picture. It consists of a large magnifying lens through which the picture is viewed. Devices containing only the lens are sometimes referred to as graphoscopes. Other models have the lens mounted on a stand in front of an angled mirror. This allows someone to sit at a table and to look through the lens at the picture flat on the table. Pictures viewed in this way need to be left-right reversed; this is obvious in the case of writing. A print made for this purpose, typically with extensive graphical projection perspective, is called a ''vue d'optique'' or "perspective view".